Machine for makfng dowel-pins



(No Model.)

G. P. STEWART.`

- MAGHINE F011 MAKING DoWEL PINS. No. 351,292. Patented Oct. 19, 1886.

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CLARENCE F. STEVART, OF NORVALK, OHIO.

MACHINE FOR lVlAKlNG DOFWEL-PINS.

SlEGICATIO forming part of Letters Patent No. 351,292, dated October 19, 1836.

Application filed May Q4, i886.

Serial No. 203,094

(No model.)

ful Improvements in Machines for Making DowelPins; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

Hy invention relates to improvements in machines for making dowel-pins, and it consists in certain features of construction and in combination ol' parts hereinafter described, and pointed out in the claims.

In the manufacture of dowel-pins the wood is cut into blocks of suitable length, and the blocks are split into rives77 of suitable thick ness, and these latter are fed, usually by hand, into a machine,where a reciprocating plunger forces the timber against the splitting-knife, severing the blank that is forced through a finishing-die. Heretofore a gage adjusted in suitable position has usually been rigidly attached to t-he bed, and the splitting-knife was arranged somewhat oblique to the line of the gage to give sufficient clearance for the blank in ease the wood should not split straight, the wood being held down by, a spring. Vith such construction, in case the wood did split straight, by means ot' the aforesaid clearance the block waslikclyto be turned to the one side and enter the tinishingdie obliquely, by reason of which many blanks were spoiled. As an improvement I set the splitting-knife parallel with the axial line of the finishing-die and provide a yielding guide-block rabbeted along the inner lower corner to engage the blank on the rear and top sides. Springs are arranged to press the guide-block downward` and forward, by means of which the blank is always firmly held against the knife and against the bed `and made to enter straight into the iinishing-die.

In the accompanying drawings, Figure l is a side elevation ot' a machine embodying my invention. Fig. 2 is a top plan partly in section. Fig. 3 is an elevation in section on the line of .r 0;, Fig. l. Fig. 4t is an elevation in section on the line of y y, Fig. 2. Fig. 5 is a rear elevation of the guide-bloek.

A represents the bed-plate, the same having suitable ways, A, in which operates a reciprocating plunger, B, a crank and pitman (not shown) or other suitable mechanism being had for operating the plunger.

G is the splittingknife, the shank of which fits in the recess a of the bed. The knife is secured by a bolt, c, that passes through the bed and through an arm, D, securing the latter, the arm being seated in arecess, a', of the bed, as shown in Fig. 2.

Eis a guide-block having an arm, E', pivoted at a to the bed-plate. The arm E is made thin laterally, so as lo be somewhat elastic. rlhe block .E is rabbeted along the lower corner on the front side, at e, so as to engage the blank on the top and rearsides. Springs e', preferably of rubber, are backed preferably by cap-shaped washers e2, adjustably secured by screws e, that engage threaded holes in the arm D. One springis made to press the block E downward toward the bed, and the other spring is made to press the block forward toward theknil'e. The knife C stands at right angles to thefaee of the bed, with the rear side of the knife set parallel with the axial lines of the die H. `By reason of the guide-block E and springs aforesaid, the blank is held firmly against the knife and against the bed, and is thus guided straight into the die.

F is a Vflange projecting upwardly from the bed, and at right angles to the latter, both laterally and vertically. The flange is more conveniently east onto the bed-plate, but may be made separately, if preferred, and bolted or otherwise secured to the bed. The flange has an opening, f, for the passage of the dowelpin, and vertical slots f, through which latter pass the securing-bolts for the plate G. This plate has lateral slots g for the passage of these bolts,and by means ofthe slotsf andg the plate G may be readily adjusted to bring the die H in line with the machine. The die H is screwed into a central screw-threaded open ing in the plate G. 'Ille cutting-edge hof the die should be placed as near the rear end of the splitting-knife and block E as will admit of a free discharge of the chips. The die internally and in 'cross section may be round, square, or of any form in which it is desired to make the dowel-pins, the round pins, however, being more commonly made.

The rives IOC of wood are held by hand against astationary gage, A2, and are forced by the plunger against the knife C, splitting off the blank.

The next blank forces the preceding blank ing plunger, of'a guide-block, the same beingy notched to engage two sides of the blank, and springs, respectively, for pressing the guideblock toward the knife and toward the bedplate, substantially as set forth.

2. In a machine for making dowel-pins, the combination, with a bed plate, a plunger mounted thereon,asplittingknife, and notched guide-block yieldingly held in position, of a supporting-plate, a finishing-die secured thereto, and the flange integral with or rigidly secured to the bed-plate, the said plate and flange having respectively elongated holes at right angles to each other for the passage of the securing-bolts, substantially as set forth.

8. In a machine for making dowel-pins, the combination,with a bed-plate having recesses a and a', made on opposite sides of the plate, of a splitting-knife and arm, D, secured in the respective recesses, said knife being set substantially parallel with the axial line of the finishing-die, of a guide-block notched to engage the blank on two sides, said block being yieldingly held in position by springs that respectively press the guide s block downward and forward, thesprings being adjustably supported from the'said arm D, substantially as set forth.

4. 'Ihe combination, with a bed plate, a splitting-knife, a finishing-die, and a recipro` eating plunger, of the block E, yieldingly se 5o cured to the bed-plate, and springs for ing the block downward and laterally..

5. In a machine for making dowel-pins, the combination, with a iinishing-die, a splittingknife set substantially parallel with the axial line of the die, and a device for guiding the pressblank, of springs arranged to press the guiding' device downward and forward, substantially as set forth.

In testimony whereof Isign this specification in the presence of two witnesses, this 7th day of May, 1886.

CL ARENCE F. STEVVAR'I.

Witnesses:

M. A. DUNToN, G. BoUGHToN. 

